updated the dtrace patch to make the stap function ngx_chain_dump() print out info about the "last_buf" and "last_in_chain" flags in bufs.
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@ -454,10 +454,10 @@ index efbc244..8d81aab 100644
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diff --git a/src/dtrace/nginx.stp b/src/dtrace/nginx.stp
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new file mode 100644
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index 0000000..8a5a54a
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index 0000000..4c228bd
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--- /dev/null
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+++ b/src/dtrace/nginx.stp
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@@ -0,0 +1,278 @@
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@@ -0,0 +1,288 @@
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+/* tapset for nginx */
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+
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+
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@ -598,6 +598,12 @@ index 0000000..8a5a54a
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+}
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+
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+
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+function ngx_buf_last_in_chain(b)
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+{
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+ return @cast(b, "ngx_buf_t", "/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx")->last_in_chain
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+}
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+
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+
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+function ngx_buf_sync(b)
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+{
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+ return @cast(b, "ngx_buf_t", "/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx")->sync
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@ -651,7 +657,11 @@ index 0000000..8a5a54a
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+ }
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+
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+ if (ngx_buf_last_buf(buf)) {
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+ out .= "<eof>"
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+ out .= "<last_buf>"
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+ }
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+
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+ if (ngx_buf_last_in_chain(buf)) {
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+ out .= "<last_in_chain>"
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+ }
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+
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+ if (ngx_buf_sync(buf)) {
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